Compilare: user.cpp: In function ‘int main()’: user.cpp:18:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=1;i<=N;i++)frA[A[i]]++; ^ user.cpp:19:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=1;i<=M;i++)frB[B[i]]++; ^ user.cpp:22:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frB[A[i]]) ^ user.cpp:24:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(top&&A[i]<st[top]&&frA[st[top]]>frB[st[top]]) ^ user.cpp:24:62: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(top&&A[i]<st[top]&&frA[st[top]]>frB[st[top]]) ^ user.cpp:26:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] frB[st[top]]++; ^ user.cpp:30:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] frB[A[i]]--; ^ user.cpp:32:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frA[A[i]]--; ^ user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s %s",A+1,B+1); ^